Can't really fit it into a specific element, can you?
What about another kind of card? Untyped.
Quantum Machine | Quantum Engine
Cost: 2 | 2
Spell
Effect:
Change your Mark to target's type and gain a Pillar | Tower of that element.
This way you keep the mechanics, you keep the difference of it being upped/unupped (since upped gains a Tower), and you can still use it unupped. Changing one's Mark is not (as has been suggested) as good as having out a pillar of a different element - although it can be more versatile. So this costing 2 quanta to gain a pillar and change the Mark doesn't seem overpowered at all, even of an unupped card...